文献类型：期刊文献

中文题名：CO_2增长对杉木中龄林针叶光合生理生态的影响

英文题名：The responses of 17-years old Chinese fir shoots to elevated CO_2

作者：张小全[1] 徐德应[1] 赵茂盛[1] 陈仲庐[2]

第一作者：张小全

机构：[1]中国林业科学研究院森林生态环境研究所;[2]中国林业科学研究院亚热带林业实验中心

年份：2000

卷号：20

期号：3

起止页码：390-396

中文期刊名：生态学报

外文期刊名：ACTA ECOLOGICA SINICA

收录：CSTPCD;;Scopus;北大核心:【北大核心1996】；CSCD:【CSCD2011_2012】；

基金：国家自然科学基金资助项目!"杉木人工林光合作用尺度转换研究 (编号 :3 9770 596);和林业部重点资助课题"江西大岗山森林生态系统定

语种：中文

中文关键词：CO2增长;杉木净光合速率;气孔导度;WEU;暗呼吸

外文关键词：elevated CO 2;net photosynthesis;transpiration;stomatal conductance;water use efficiency;dark respiration

分类号：S718.512.1;S718.4

摘要：通过对 1 7a生杉木人工林小枝的活体测定 ,研究了大气 CO2 增长对杉木中龄林净光合、呼吸、气孔导度和水分利用效率等生理生态特性的影响。结果表明 ,在 CO2 浓度为 4 5μmol/ L左右时 ,杉木针叶净光合速率比正常大气 CO2 下提高 1倍以上 ,气孔导度和蒸腾速率有不同程度的降低 ,水分利用效率提高约 1～ 2倍 ;同时使光补偿点降低 ,饱和点和光抑制点提高 ,光量子效率提高 4 0 %～ 2 95%且阳枝大于阴枝 ,针叶暗呼吸降低 2 0 %～ 72 %。随着 CO2 浓度的增加 ,针叶净光合速率和水分利用效率呈线性上升 ,约到 4 5μmol/ L以后 ,增加速率减慢 ,但 CO2 饱和点可达 1 1 6μmol/ L以上。杉木针叶对CO2 增长的这种反应 ,对大气 CO2 不断增长的条件下杉木生长是有利的 ,但对其长期反应还有待进一步研究。
The net photosynthesis (Pn) ,transpiration( TR) ,stomatal conductance( COND ),water use efficiency( WUE )and dark respiration( DR )of 17 year old Chinese fir shoots under ambient and elevated CO 2 conditions were measured with LiCor 6200 Photosynthesis system,and their responses to elevated CO 2 were discussed.It was suggested that compared to the ambient air CO 2 concentration. Pn under 45μmol/L CO 2 was doubled and COND and TR decreased to some extent,leading to the increase of WUE by 100%～200%;at the same time. DR reduced by 20%～72% and quantum efficiency increased by 40%～295%;light compensation point deereased while light saturation point and light inhibition point elevated.It was also found that with the increase of CO 2 concentration. Pn and WUE increased linearly until around 45μmol/L CO 2,the increasing rates reduced,but the CO 2 saturation point for Pn was higher than 117μmol/L.It was concluded that the increasing CO 2 concentration in the atmosphere would be beneficial to Chinese fir in a short term,but its long term responses are not determined and need to be further studied.